RE: Re: Convert your MOT to NST?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>

Hi Cory

Greg's mot is probably arcing between the core and the secondary, where
portions of the secondary are hidden from view by the core. Oil would help
prevent this type of external arcing. I agree that oil would not penetrate
very far into the secondary. 

Godfrey Loudner

> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Wednesday, January 23, 2002 2:06 PM
> To:	tesla-at-pupman-dot-com
> Subject:	Re: Re: Convert your MOT to NST?
> 
> Original poster: "Cory Roussel by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <imcuddlycory-at-yahoo-dot-com>
> 
> Hello,
> 
> 
> About your ideas- whoa- hold on, how would an oil bath
> work on a MOT??  The secondary turns seem way too
> tightly wrapped to fit any oil in... The insulation
> seems to make a fluid proof seal.
> 
> 
> Cory Roussel
> 
> 
> > certainly more than 2KV. Just for grins, I chopped
> > off
> > the primary and replaced it with about 50 turns of
> > 14AWG to increase the turns ratio. Stimulated by the
> > dimmer/cap combo, the modified MOT sprouted arcs of
> > about 1/2" to 5/8"--for a few seconds. Then it died.
> > I
> > could still hear it arcing somewhere. I'm sure it
> > was
> > inside the secondary or perhaps from the secondary
> > to
> > the core somewhere out of sight. Too bad. It
> > certainly
> > validates your principle though. Maybe I should try
> > this again with the MOT in an oil bath?
> > 
> > Spark On,
> > 
> > Greg
> > http://hot-streamer-dot-com/greg
> > 
> > --- Tesla list <tesla-at-pupman-dot-com> wrote:
> > > Original poster: "S & J Young by way of Terry
> > Fritz
> > > <twftesla-at-qwest-dot-net>" <youngs-at-konnections-dot-net>
> > > 
> > > Hi list,
> > > 
> > > MOTs are sometimes used to power TCs.  MOTs are
> > > typically free, don't break
> > > down like NSTs often do, and are good for 1 KVA or
> > > so.  On the downside, the
> > > 2 KV voltage is on the low side, requiring 2 or 4
> > in
> > > series and/or voltage
> > > multipliers, and the current is rather high,
> > making
> > > it tough to cool and
> > > quench spark gaps.  And their self-current
> > limiting
> > > (magnetic shunts) are
> > > not all that effective.
> > > 
> > > Can these limitations be overcome?  Yes, sortof.  
> > I
> > > tried an experiment and
> > > got around 10 KV out of one at reduced current -
> > > probably 100 ma or so
> > > average.  How?  By driving the MOT from a lamp
> > > dimmer and 15-30 mFd cap in
> > > series.  Same idea as driving an ignition coil for
> > a
> > > TSG, only with more
> > > input power.  The voltage is much higher than
> > normal
> > > because of the more
> > > rapidly changing magnetic field, and the average
> > > current goes down because
> > > power is applied for only part of a cycle.
> > > 
> > > The insulation of the MOT I tried did not break
> > down
> > > for output arcs that
> > > would bridge 1/4 to 3/8 inch.  It would be a good
> > > idea to immerse a MOT run
> > > this way in oil to improve its chances for long
> > term
> > > survival.
> > > 
> > > Using just a straight dimmer, the operation was a
> > > bit flaky, as others have
> > > reported in trying to drive an inductive load.  I
> > > didn't try adding a second
> > > triac, but I am sure that would improve
> > performance
> > > a lot.
> > > 
> > > So one can get NST-like performance out of a MOT
> > if
> > > driven in this unusual
> > > way.  A pair of them would be good for 16-20 KV at
> > a
> > > 100 ma or so, depending
> > > on the size of the series cap used (use motor run
> > > caps).
> > > 
> > > Just something to consider and tinker with if you
> > > are so inclined.
> > > 
> > > --Steve
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > 
> > 
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